Williams Sound SoundPlus Infrared System WIR SYS 90V Przewodnik Instalacji Pobierz pdf (Strona 8)

Williams Sound

Helping People Hear

LEVEL INDICATOR

The bar graph indicator shows audio level in 3dB steps at the input of the audio level processing

circuit. The indicator is peak responding and is calibrated so that optimum level is reached

when the amber +3 and +6 lights usually blink and the red +9 light blinks occasionally. Use the

level controls to set the audio levels.

REQUENCY (CARRIER)

Channel A and B have four “on” indicators to designate 2.3, 2.8, 3.3, or 3.8 MHz frequency. The

carrier comes on when power is applied, but goes off automatically if there is no audio for

approximately 30 minutes. Audio sufficient to light the -18 level indicator will reset the timer,

allowing for another 30 minutes of no audio before the carrier shuts off again. This timer can be

disabled.

See pages 9, 11. The operating frequency for each channel is selected by DIP switches.

COMPRESS CONTROL

The Compress Control increases transmitted audio up to 30 dB during periods of low level sound.

To increase compression, use a tuning wand (PLT 005) or small screw driver and gently turn the

compression pot clockwise. The compression slope can be adjusted from 1:1 (no compression)

to 4:1 (substantial compression).

Compression is used for hearing assistance applications to reduce dynamic range.

Compression is not normally used in language interpretation application. Note: The modulator

has been pre-set for minimum compression. Refer to page 11 for an explanation of compressor

settings on the MOD 232.

HONES

The phones jack monitors the transmitted audio signal. If the modulator is operating in two

channel mode, Channel A or Channel B can be selected for monitoring. If the modulator is

operating in stereo mode, the jack produces a stereo output. Use the phones jack to verify the

quality of the transmitted audio.

HONES SWITCH

Push-button selector to monitor Channel A or Channel B audio when not in stereo mode.

NPUTS MIXED LED

Indicates Channel A and Channel B audio are mixed and transmitted by Channel A. Channel B

carrier is off.

TEREO LED

Indicates stereo mode. Audio processing (compression, limiting) are coupled and adjusted by

the Channel A compression adjust. Channel frequencies are forced to 2.3 and 2.8 or 3.3 and 3.8.

IR LED

The IR LED transmits a short range (about 1 meter) infrared signal. Infrared receivers can be

tested using the infrared LED. The signal emitted from this LED is modulated by the carriers

generated in this unit only. If this smodulator is connected to other modulators for additional

channels, their carriers are not emitted by the LED, and must be monitored at those modulators.

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Williams Sound SoundPlus Infrared System WIR SYS 90V Przewodnik Instalacji Strona 8